docs: regression, no python property in schema #246

Is something unclear, missing or outdated in our documentation?

Schema generation introduced in 5ebeda6 is defining all the properties as belonging to root instead of python.

Relevant code snippets

Invalid

plugins:
  - mkdocstrings:
      handlers:
        python:
          import:
            - https://docs.python.org/3/objects.inv

valid (wrong)

plugins:
  - mkdocstrings:
      handlers:
        import:
          - https://docs.python.org/3/objects.inv

Link to the relevant documentation section

https://mkdocstrings.github.io/python/schema.json
https://mkdocstrings.github.io/schema.json